Adjustable plant box railing bracket



FIG. 1 is a left side view of a first variant of an adjustable plant box railing bracket;

FIG. 2 is a top view of the first variant of the design;

FIG. 3 is a bottom view of the first variant of the design;

FIG. 4 is a right side view of the first variant of the design;

FIG. 5 is a front side view of the first variant of the design;

FIG. 6 is a rear side view of the first variant of the design;

FIG. 7 is a perspective view of the first variant of the design;

FIG. 8 is a perspective view of the first variant of the design depicted with environmental subject matter;

FIG. 9 is a left side view of a second variant of the design;

FIG. 10 is a top view of the second variant of the design;

FIG. 11 is a bottom view of the second variant of the design;

FIG. 12 is a right side view of the second variant of the design;

FIG. 13 is a front side view of the second variant of the design;

FIG. 14 is a rear side view of the second variant of the design; and,

FIG. 15 is a perspective view of the second variant of the design.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for an adjustable plant box railing bracket, as shown and described. 